Strip burster



J. T. DAVIDSON 2,380,949

STRIP BURS TER Aug. '7, 1945.

Filed Ot. s, 1942 4 Sheets-Sheet 2 INVENTOR JOHN Z'DAV/DSON Aug. 7, 1945.

.1. T. DAVIDSON 2,380,949

' .STRIP BURSTER FiledOct. 5. 1942 INVENTOR 1/ ///v ITDAV/DSO/V ATTO NEY 4 Sheets-Sheet s I Aug. 7, 1945. J. T, DAVIDSON ,380,

STRIP BURSTER Filed 001;. 3, 1942 4 Sheets-Sheet 4 INVENT'OR (JOHN IDA I Patented Aug. 7,1945.

UNITED "sTATEst PATENT OFFICE STRIP BURSTER J ohn T. Davidson, Dayton, Ohio, assignor to The Standard Register Company, Dayton, @1110, a

corporation of Ohio Application October 3, 1942, Serial No. 460,657

18 Claims; (01. 164-845) This invention pertainsto strip or web feeding and severing apparatus, by which a continuous strip of material is automatically divided at predetermined longitudinally. spaced intervals into a succession of individual sheets, and more particularly to intermittent strip tensioning mechanism, wherebysucbessively advanced terminal portions of the strip are tensioned beyond, the tensile strength of transverse weakened division lines within such advanced portions, and thereby progressively detached from the supply portion of the strip or web.

It is quite common commercial practice to in'-- scribe continuous series connected printed forms, such as checks, utility bills, invoices, statements and other record sheets while'intact, by passing such strips either singly or in multiple, with interleaved transfer material, through a writing or imprinting machine. Subsequently,'. the strips are divided between successive inscribed forms into individual-sheets. To facilitate separation, the record strip is provided with longitudinally spaced transverse weakened division lines, upon which the strip is bursted by being subjected to excessive longitudinal pulling strain,- as the line containing area reaches severing position.

Simultaneously with the advancement of the strip relative to the severing or bursting position, the margins thereof are automatically trimmed to remove marginal configurations or feed band areas engaged by strip feeding devices,

'an apparatus of compactform and possessing minimum power requirement for its operation.

' A further object of the invention is to enable the advancementof the strip to be properly synchronized with the strip bursting devices and to enable a continuous strip of'material to be ac-: curately divided into uniform sheets of greater or less length. I

A further object of the invention is to provide strip tensioning mechanism by which the advanced terminal portion of the strip is momentarily subjectedto accelerated advancement while the trailing portion of the strip is simultaneously snubbed or retarded in opposition to the accelerated feeding influence, thus subjecting a transverse weakened line of. the strip intermediate the points of accelerating and retardinginiluence to excessive tension and bursting strain.

which serve to control and'time the advancement The object of the invention is to improve the construction as weli'as the-means and mode of operation of strip feeding and severing machines, whereby they may not only be economically manufactured and operated, but will be more efficient in use, automatic in operation, uniform in action, of simplified form, having relatively '7 few parts, and be unlikely'to get out of repair.

A further object of the invention is to provide A-iurtherobject of the invention is to provide combined strip trimming and severing devices operating harmoniouslyin continuous sequence.

A further object of the invention is to provide adjusting means by which accuracy and certainty of operation are assured.

A further object of the invention is to'provide a strip feeding and bursting machine having the advantageous structural features and' inherent meritorious characteristics and mode of operation herein set forth.

With the above primary andother incidental objects in view as will more fully appear in the specification, the invention intended to be pro-.

tected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, or their equivalents, as hereinafter described or illustrated in the accompanying drawings.

In the drawings, wherein is shown the preferred but obviously not necessarily the only form of embodiment of the invention, 4 Fig. 1 is a front elevation of the assembled machine viewed from the right of Figs. 2, 4 and5.

Fig. 2 is an end elevation of the machine show ing a portion of the driving train viewed from the left of Fig. 1.

Fig. 3 is an end elevation, partly broken away,- opposite that of Fig. 2, as viewed fromthe right,

of Fig. 1.

Fig. 4 is a vertical'sectional view of the feeding and bursting mechanism during the interim period between bursting operations while the strip is being freely advanced.

Fig. 5 is a view similar to that of Fig. 4 at the moment of bursting operation.

Figs. 6 and 7 are detail sectional views.

Fig. 8 illustrates a disc for forming a longitudinal weakened line upon which the marginal portion of the strip is subsequently separable.

Fig. 9 is a fragmentary view of a portion of the fielbord strip provided with a weakened division Like parts are indicated by similar characters of reference throughoutthe several yi'ews.

The present burstingmachine is of relatively small size and compact form adapted to be suplo ported in elevated position on a table or stand. The frame of the apparatus comprises relatively spaced upright end plates l and 2 supported upon a base I and interconnected by tie rods 4.

The driving gear trains beyond the end plates I and 2 are enclosed and protected by easing or housing portions 5, which continue at 5' at the front and rear of the frame and enclose the driving motor 6. The operating mechanism by which the strip or web is advanced and tensioned to the bursting point is exposed between the end plates.

This mechanism includes-a pair .of frictional feeding and snubbing rollers I and I and a pair of frictional tensioning 6r snatch rollers 8 and It. At least one of the *latter is driven at a greater peripheral speed than the snubbing rollers I and I. The rollers 'I and 8, are rubber covered, or of analogous material, having a'tenacious strip engaging surface, and preferably comprise a plurality of axially adjustable relatively spaced rubber collars or rings mounted on corresponding shafts II and II. The corresponding frictional rollers 8 and it are preferably metallic rollers havin knurled surfaces, but may also be of rubber or the like. The strip engaging collars of the roller l are mounted for axial adjustment .to and fro upon a common shaft it, while the rollers l0 pref- The pin wheel it maintains constant feeding engagement with the strip, whereas the rollers 1-8 and 8-H engage therewith only intermittently.

'As a result, the rollers 1-8 operate conjointly with the pin wheel to impart movement and control the advancement 'of the strip during a part of the cycle of operation, during the remainder of which the strip is advanced by the pin wheel i5 aloneindependently of the friction rollers I and 8:-

To enable the vibratory movement of the snubbing and snatch rollers 8 and it toward and from the corresponding rollers 'l and l, the shafts, 5 and ii for the latter-are joumaled in the side frames l and 2 for rotation on fixed axes, while the roller shafts I; and II of the matching rollers I and II are mounted for bodily movement rela-' tive to the shafts I I and I2 and the rollers carried gq thereby. Pivotally mounted on a transverse shaft i8 sup- I ported in the side plates land 2 is a pair of oscillatory arms. I! in which the roller shafts l3 and ll are journaled. The rock arms II are actuated in timed sequence. with the advancement of the strip to momentarily grip the strip between the respective pairs of rollers l--8 and 8-! 0 by rotary cams it carried upon a revoluble cam shaft is journaledj in the end plates of the frame, and

The shaft extension carries a gear pinion 23 be- -hlnd the pulley 22.which meshes with the larger of a pair of inter-connected concentric idler gears '24, the smaller member 2| of which meshes with a 'gear pinion 20 upon the extremity of the snubbingroller shaft Ii. The ratio of the several gears is such that the snubbing roller 1 is driven at a peripheral speed materially less than that of the tensioning or snatch rollerl. The roller I I and shaft H are preferably loose and rotate idly under friction driving influence of the roller 8 and the strip therebetween.

The snubbing roller shaft ll carries at its oppositej end beyond they end frame plate 2 a pair of gear pinions 21 and 28. The pinion 21 of lesser pitch intermeshes with a large idler gear 20 mounted on an adjustable arm I. which is pivoted upon the extension of the shaft Ii concentric with the gear pinions 21 and 2|. The swinging arm I. carrying. the gear 29 is adjustable to and fro within the limits of a concentric arcuate slot Ii in the end plate, and is secured in adjusted position by a clamp bolt 32 in the swinging arm engaging in such slot.

By adjustment of the swinging arm II the large idler gear may be made to intermesh with any one of a plurality of interchangeable gear pinions II V of different size mounted on the extremity of the cam shaft It. By interchanging other gears 38 of larger or smaller size, the cam shaft is made to rotate faster or slower, and the timing of the mounting arm oscillations is correspondingly changed to permit greater or less lepgths of the strip material to be advanced during the periods between succeeding enga ements of the rollers therewith to effect the strip severing operations. This accommodates strips or webs having diflerently spaced transverse weakened lines, and enables uniform severance thereof into sheets of greater or less length, according to the relative spacing of the division lines.- The gear pinion 28 upon the extremity ofthe snubbing roller shaft ll meshes with a corresponding gear pinion 34 uponthe extremity of the lower snubbing roller shaft II, which shaft also carries the strip feeding pin wheels II. Inasmuch as the shaft I3 and gear 34 are movable through a 'very short range toward and from the shaft II and intermeshing gear "in unison with the vibration of the oscillatory mounting 'arms ii, the intermeshing gears 28 and are of somewhat greater pitch than the gear 21, and their teeth are elongated suillciently to maintain their intermeshing relation throughout the range of such relative movement. The

rotation of the shaft II and gear 28 thereon thus transmits continuous rotary'niotion to the shaft i1 and the pin wheels ll mounted thereon notwithstanding the vibratory motion of the shaft it and gear 84.: .Upon approach ofthe shafts I I and I3 and the rollersT-J carried .thereby, the pin wheels are shiftedvin unison therewith while maintaining their feeding engagement with the strip. As the rollers 1-4 impinge upon the interposed web or strip, they impart thereto by frictional engagement a forward feeding action in unison with the feeding influence of the strip engaging pin wheels ll.

However, upon retraction of the arms I! and therewith theshaft l3 and roller 8, the pin wheels continue to advance theweb or strip. f During the interval between of the strip be- 2,880,949 tween opposing rollers, the terminal portion ofarms H by the cams l8, the strip will be simultaneously grasped between the respective pairs of rollers 1-8 and 9-|0 which rotate at diflereht rates of peripheral speed. The snatch rollers 9-40 being more rapidly rotated than the snubbing rollers '|8 will impose a strong longitudinal pulling strain upon the strip which is resisted by the more slowly rotating snubbing rollers 1-8, whereby the strip is subjected to tensioning influence in excess of the tensile strength of the strip coincident with the transverse weakened division line then positioned between the pairs of rollers. At the same time, the strip will be advanced by the snubbing rollers in unison with its advancement by the pin wheels I 5, so that the timing of the strip is maintained and the pin wheels are protected and relieved of the strain of the tensioning by the snatch rollers 9l0. The

strip iails coincident with the transverse weakened line under the excessive tension imposed thereon and the separated terminal portion is discharged by continued rotation of the rollers t l and'the momentum of the severed'sheet into the sheet receiver 35.

Guide fingers 36 adjustably mounted on a transverse rod 4' maintain the advancing strip in feeding engagement with the pin'wheels IS. The latter are axially adjustable upon the shaft 13 to accommodate strips or webs of different widths.

As the web or strip is advanced, the marginal configurations or feed bands are trimmed oil by severing discs 38 which coact with the peripheries of the pin wheels ii in offset relation with the line of feeding pins. The trimmer discs may be sharp and operate to shear the strips, or may be dull, in which event they serve to break the strip on longitudinalpreweakened division lines. The trimmer discs 38 are carried by arms 39 secured to the shaft it, upon which the oscillatory mounting arms ii are pivoted. The shaft I6 is mounted in the end plates 9 and 2 for rocking motion. It is provided at one extremity with a crank arm il carrying a spring actuated locking plunger M,

upon disengagement of which the shaft I may be rocked by the crank to lift the arms 39 and remove the trimmer discs from strip severing relation with the pin wheels to facilitate introduction of a new strip or web to be trimmed and severed.

To enable relative adjustment of the opposing snubbing and tensioning rollers, as may be necessary to achieve proper cooperation therebetween,

centric bearing, the positions of the vibratory arms I! may be slightly varied to bring the opposing rollers of the respective pairs into proper degree of gripping relation with the strip and in adjusted relation with each other. Similar eccentric rotatively adjustable mountings 45 are provided for the rollers 20 upon the vibratory arms I! to vary the response of the arms to the action of the rotary cams l8.

A table lfiintermediatethe respective pair of rollers temporarily supports the severed portion of the strip and guides the terminal edge of the supply strip between the tensioning rollers after each severing operation. The rear wallof the receiving compartment extends at 41 into adjacent relation with the tensioning rollers to receive the severed portions of the strip therefrom and guide them into the receiving compartment. The driving motor 6 is mounted upon an oscillatory shelf 48 pivoted at 50 to the main frame, whereby the deflection of the mounting shelf under the weight of the motor serves as a belt tightener to keep the drive belt 2i under proper driving tension.

In Fig. 8 there is shown a marginally serrated disc 5i for perforating or otherwise weakening the strip on a longitudinal line 52 to enable subsequent separation of the marginal feed band, in lieu of shearing or trimming the strips bythe disc 38 as they pass through the machine. Such temporary retention of the-punched marginal portion on the severed sheets is desirable when the sheets are to be subsequently collated in predetermined relation, as for example, upon a peg board 'or when the holes are to be temporarily employed for binding purposes.

Fig. 9 illustrates a portion of the strip provided with such weakened line, and the marginal area partially. separated. I

From the above description it will be apparent that there is thus provided a device of the character described possessing theparticular features of advantage before enumerated as desirable, but

which'obviously is susceptible of modificationin its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

. While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprise the preferred form of several modes of putting the invention into eiiect, and the invention is therefore claimed in any of its forms or modifications Within the legitimate and valid scope of the appended claims.

Having thus described my invention, I claim:

1. .A strip severing apparatus for progressively dividing a continuous strip of material into a succession of individual sheets upon longitudinally spaced transverse weakened division lines by sublecting succeeding terminal portions of the strip to longitudinal pulling strain in excess of the tensile strength of. the strip coincident with such weakened lines, including two pairs of relatively spaced rollers having intermittent gripping engagement with the strip at opposite sides of a transverse weakened line thereof, one roller of each pair being movable simultaneously into cooperative relation with the opposing rollers of the respective pairs at timed intervals, driving mechanism for actuating the respective pairs of rollers at different peripheral speeds, a strip feeding device mounted concentrically with one of said movable rollers for advancing the strip predeterj chronism with the advancement of the strip.

2. A strip severing apparatus for progressively difiding a continuous strip of material into a succession of individual sheets upon longitudinally spaced transverse weakened division lines by subjecting succeeding terminal portions of the strip to longitudinal pulling strain in excess of the tensile strength of the strip coincident with such weakened lines, including a main frame, a pair of relatively spaced rollers mounted in the main frame for rotation on fixed axes, a vibratory frame pivoted to th main frame, a pair of relatively spaced rollers carried by the vibratory frame and movable therewith into and out of cooperative relation with the flrst mentioned pair of rollers to intermittently grip a strip of material to be severed therebetween, motion transmitting means for rotating at least two of the relatively spaced rollers at a different peripheral speed, a strip feeding device for advancing a strip to be severed relative to the said rollers, and operating means for vibrating the pivotally mounted roller carrying frame in timed relation with advancement f the strip to intermittently simultaneously grip the strip at opposite sides of a transverse weakened line between relatively spaced rollers rotating at different peripheral speeds.

3. A strip severing apparatus for progressively dividing a continuous strip of material into a succession of individual sheets upgn longitudinally spaced transverse weakened division lines by ubjecting succeeding terminal portions of the strip to longitudinal pulling strain in excess of the tensile strength of the strip coincident with such weakened lines, including a pair of tensioning rollers and a pair of snubbing rollers rotating at different peripheral speeds, strip feeding means for advancing the strip in synchronism with the rotation of the rollers to position a transverse weakened line of the strip intermediate the respective pairs of rollers preparatory to succeeding strip gripping actions thereof, and common operatin means for intermittently shifting the strip feeding means and the rollers of the respective pairs toward and from coacting rollers of the pairs to simultaneously grip an intermediate strip and means for actuating the frame in timed relation with the advancement of the strip, the construction and arrangement being such that the dual strip feeding devices have simultaneous feeding engagement with the strip during a part of the cycle of operation, one of said strip feeding devices having operative feeding engagement with the strip to the exclusion of the other strip feeding device during the remainder of the cycle of operation. a

6. In a strip feeding device for advancing a continuous strip of material, argtary shaft, a pin wheel continuously engageable in longitudinally spaced conflgurations of the strip, and a frictional'roller intermittently engageable with the strip mounted in concentric relation upon the rotary shaft for intermittent simultaneous feedin engagement with the strip.

7. A strip feeding device for advancing a continuous strip of material, including a pin wheel operatively engaged with the strip and a frictional roller concentrically positioned therewith for intermittent engagement with the strip.

8. A strip feeding device for advancing a continuous strip of material, including a pin wheel and a frictional roller concentrically positioned for simultaneous operative feedin engagement with the strip, and a member with which the friction roller intermittently cooperates to impart of material at opposite sides of a transverse weakened line thereof.

4. A strip severing apparatus, wherein successively advanced terminal portions of a continuous strip of material are intermittently tensioned beyond the tensile strength of transverse weakened division lines within such advanced positions and thereby bursted into individual sheets, in-' cluding a pair of relatively spaced rollers rotating at different peripheral speeds, a vibratory frame, a pair of correspondingly spaced rollers carried thereby for intermittent grippingengagement with a continuous strip of material advanced therebetween to tension an intermediate portion of the engaged strip, and driving means for imparting different peripheral speeds to mating rollers of the assembly and for oscillating the vibratory frame.

5. A stripsevering apparatus, wherein a continuous strip of material is progressively transversely severed at longitudinally spaced intervals into a succession of individual sheets, including a strip severing device, dual frictional and pin type strip feeding devices, a vibratory frame upon which the dual strip feeding devices are mounted,

- strip of material having longitudinally spaced advance motion to a strip of material concurrently with its advancement by the pin wheel, the v latter being effective to advance the strip during non-strip feeding periods of the roller.

9. A strip feeding and severing apparatus for progressively transversely dividing a continuous strip of material into a succession of individual sheets, including a strip severing device and a therewith.

10. A strip separating apparatus, including a pair of rollers mounted for rotation on fixed axes and revoluble at diiferent peripheral speeds, a second pair of rollers cooperating respectively with the rollers of the first mentioned pair, strip feeding means for advancing intermediate the pairs of rollers a strip of material having transverse longitudinally spaced weakened lines therein, a vibratory carrier for the strip feeding means and the rollers of the second pair intermittently shifting the rollers of one pair into strip engaging relation with the rollers of the other pair, and actuating means for driving the rollers and strip feeding means and vibrating the carrier in timed sequence.

11. A strip separating apparatus, including two pairs of strip engaging rollers, the rollers of the respective pairs being revoluble at different petransverse weakened division lines, intermediate the rollers, and driving means for rotating the respective pairs of-rollers at different peripheral speeds and changing the relation of the rolls of 2,sso,94e

each pair into and out of unison engagement with the strip simultaneously with the advancement of the strip relative thereto.

12. A strip separating apparatus, including. a strip severing means for transversely dividing a continuous strip of material at predetermined longitudinally spaced intervals, including a friction roller intermittently engageable with the strip for advancing the strip to the severing de-" vice and resisting accelerated advancementthereof, and a pin wheel mounted-concentric with vice for advancing the strip at a speed substanthe said friction roller for unison rotation having feeding engagement ,with the strip simultaneously with its engagement by the friction roller and maintaining its feeding engagement therewith during interim periods between successive'intermittent periods of engagement of the roller therewith.

13. A strip separating apparatus, including strip severing-means for transversely dividing a continuous strip of material at longitudinally spaced intervals, including a vibratory friction roller intermittently bodily movable into and out of engagement with the strip for advancing the strip to the severing device and resisting accelerated movement thereof,a pin wheel mounted concentrically with the friction roller for unison rotation and bodily movable therewith,- said pin wheel maintaining constant engagement with. the

I strip during vibratory movement of the roller to advance the strip conjointly with the roller during engagement of the latter with the strip and independently thereof durin interim periods between succeeding periods of intermittent engagement of the roller with the strip.

14. As an article of manufacture, a revoluble friction roller for intermittent frictional feeding engagement with a continuous strip of material and a pin wheel mounted concentric with the roller for unison rotation therewith and having continuous feeding engagement with the same strip of material. 7 g

15. A strip severing apparatus, including strip tensioning device intermittently engageable with the strip to exert pulling influence thereon in excess of the tensilestrength of a transverse weakened division line thereof, a pair of snubbing rollers, at least 'on& of which is bodily movable tially' equal to the peripheral speed of the snubbin 'rollers and movable in unison therewith, and driving means for actuatingrthe tensioning device,

the strip feeding device and the snubbing rollers in synchronism. V

16. A strip severing device, including a pair of strip tensioning rollers and a relatively spaced pair of strip snubbing rollers, a vibrator carrier upon which one roller of each pair is mounted for simultaneous intermittent movement toward and from the other member of the respective pairs of rollers to momentarily grip ,a strip to be severed therebetween, a strip feeding device mounted upon the vibratory'carried and operative to advance the strip relative to the rollers, and driving means for imparting to the tensioning rollers peripheral speed greater than that of the snub-'- bing rollers and to the strip feeding device a speed substantially equal to the peripheral speed of the snubbing rollers and for vibrating the carrier in timed sequence with the operation of the rollers and feeding device. v

17. A strip severing apparatus, including a strip feeding device, a striptensioning roller, a strip snubbing roller, a vibratory mount common to the snubbing and tensioning rollers, power means for imparting to the tensioning and snubbing rollers differential peripheral speed by which the tensioning roller speed exceeds that of the snubbing roller, and actuating means for vibrating the roll mount to effect intermittent engagement of the tensioning and snubbing rollers withthe strip simultaneously and for actuating the relative to the other to engage the strip and restrip feeding devic to advance the strip at a speed substantially equal to the peripheral speed of the snubbing roller. w 1

18. A strip severing apparatus, includin a strip tensioning device and a snubbing device intermittently engageable with a continuous strip simultaneously to subject the strip to longitudinal pulling strain in excess of a transverse weakened division line of the strip and to simultaneously resist such pulling strain, a strip feeding device for continuously advancing the strip relative to the tensioning and snubbing devices, a vibratory control member common to the tensioning and snubbing devices for effecting intermittent timed engagement thereof with th strip, and driving means for operating the several de-' vices in timed sequence.

-JOHN T. DAVIDSON.- 

